Earth moving scraper



Dec. 11, 1934. .1. s. STEWART 1,983,783

EARTH MOVING SCRAPER Filed Nov. 29, 1933 2 Sheets-Sheet 1 v b. w w

INVENTOR B W' {Aka/- 44- ATTORNEY Dec. 11, 1934. I J 5 STEWART 1,983,783

EARTH MOVING SCRAPER Filed Nov. 29, 1955 2 Sheets-Sheet 2 5 -//.//IIYV,ENTOIRI v BIVY wld/yj f i 44- A TTORNE Y Patented Dec. 11, 1934 UNITED STATES PATENT OFFICE EARTH MOVING SCRAPER James S. Stewart, Sidney, Ohio, assignor to The Slusser-McLean Scraper Company, Sidney, Ohio, a corporation of Ohio Application November 29, 1933, Serial No. 700,282

Claims. (01. 37-140) This invention relates to new and useful im-. In front'of the apertures 12, and depending provements in earth moving scrapers. from each of the end plates and 11, is a torque It is one of the principal objects of my invenarm 14, having therein a rearwardly inclined tion to provide an earth moving scraper having elongated slot 15, surrounded by a reinforcing 5- load control means which enables it to be placed pad 16 similar to the pads 13, 13. The function 5 in a loading position at any time without stopof the aperture 12 and slot will be hereinafter ping the tractor. In other types of scrapers, it described.

is not possible to pull the bowl back into a load- Adjacent the inner face of each one of the end ing position, after it is unloaded, without stopping plates 10 and 11, and projecting rearwardly in 10. the tractor. alinement therewith, are freely mounted latch 10 It is another object of my invention to provide pla es 17 d each having a p fi Similar to a scraper which can be easily operated by hanthe plates 10 and 11, except however that at their dles to pick up a load and unload it at any deforward free ends these latch plates terminate sired time. The operating parts of the scraper in forwardly inclined arms 19. Intermediate 15. are in almost perfect balance, and are under the these arms 19 and the rearward end of the latch 15 operators control at all times. plates 17 and 18, the latter are formed with raised Another object of my invention is the provision central flanges 20. of a spreading stop that may be adjusted to reg- Each of the latch plates 17 and 18 is provided ulate the depth at which the unloaded dirt may with a torque arm 21, similar to the torque arms 0 be spread by the scraper. 14. Welded or otherwise secured to the outer 20 Other important and incidental objects will be face of each arm 21 is a torque stud 22, adapted brought out in the following specification and to be slidably received by the elongated slot 15 particularly set forth in the subjoined claims. in it a ja end Plate 10 In the accompanying drawings illustrating my The rearward ends of these latch plates are invention, Figure 1 is a perspective view of my apertured to receive therein the reduced inner 25 scraper, showing the general arrangement of its ends of a flanged tru bearing .Eaeh of various elements. Figure 2 is an end view of the these bearings 23 is formed With an axial bore same, and Figure 3 is a partial top plan i 24 in which there is rotatably mounted'the outer thereof, showing the bowl mounting bearing in d e d 25 Of a fl d trunnion hsection. termediate the outer end 25 and a bolt flange 27 30 Referring now to the drawings, the n l 1 formed at its inner end, each trunnion has a indicates a triangular hitch or towing frame for n r p ip r l flange 28- Wh n he runnion an earth moving scraper, consisting of a central bearings 23 are inserted in the latch plates and towing member 2 and converging id members 18, and against their outer faces, the outer re- 3 and 4. At their forward ends where they meet, dueedend 25 0f the tTuImiOIlS Will be received by 5 these members are secured together by bolts 5, 5. the bores 24 from the pp t or i n r fa s At the extreme forward ends of the members 3 the latch plates 0 bring the flanges 3 aga ns and 4, I have provided a series of vertically alined Said faces and trunnion bearings holes 6 to provide an adjustable connection with AS Shown in Figures 2 and I v p d the towing bar of a tractor or other prime mover each trunnion an inverted U Shaped thrust 4 t shown (s Figure 1, collar 29 having in one face thereof a recess 30 t th rear nd of th towing frame a cross inwhichithe'flange 28 is received. This collar bar 7 is secured between the rear ends of the 29 is'rseculed t0 the leteh'plate by bolts 3 side members 3 and 4, and at its center, it is bolted P through flange, the latch p a nd or otherwise attached to the rear offset end a of the flange of the trunnion bearing 23, to thus 45 the center member 2 to form a rigid towing frame. firmly attach each trunnion b ar n to its re- Projecting rearwardly from the hitch frame spective. latchplate and secure the trunnion and secured by bolts 9, to the outer face of the against end-Wise movement-1 (See Figures 2 side members 3 and 4 are parallel end plates 10 and and 11. At its rear end, each of these end plates The inner flanged end of eafih trunnion 15 50 is formed t a horizontal, elongated bearing attached by bolts 32 to the center of a circular receiving aperture 12, reinforced by a peripheral disc-like head 33 at each end of a Scraper Wl flange or pad 13, welded or otherwise secured to 34 positioned between the latch plates 1'? and 18 the outer face of the end plate. (See Figures 1, and in alinement with, and behind, the towing .55 2 and 3.) or hitch frame l. (See Figures 1, .2. and 3.)

Each of the heads 33, 33 is reinforced by a peripheral L shaped flange 35, whose radial leg is secured to the head by rivets 36. Formed on the lower side of each head is a flat surface in the plane of the earth and against which there is secured by rivets 3'7, through the flange 35 on each head, a scraper bit or blade 38.

The scraper blade 38 extends transversely between the heads 33, 33 to form a flat horizontal bottom for the scraper bowl 34. Along its forward edge the blade 38 is beveled to provide an earth biting edge 39, and at its rearward edge, the blade is attached to a bottom transverse flange 46 formed on the lower edge of the curved rear wall 41 of the bowl, practically quarter circular in extent, and welded or otherwise secured to the periphery of the heads 33, 33 and their reinforcing flanges 35, 35.

Also secured to the flanges 35, 35 on the heads 33, 33, and in front of the trunnions 26, 26 are arcuate wear shoes 42, 42 whose lower ends terminate sufficiently above the forward edge of the blade 38 so that they will not impede the movement of earth into the bowl. (See Figures 1, 2 and 3.) On each head 33, 33 I have provided a series of circumferentially spaced holes 43 to receive bolts 44 by which there is adjustably attached to the outer face of each head, and in front of the trunnions 26, 26, a loading stop 45; and behind the trunnions an unloading stop 46. These stops 45 and 46 are similar, and consist of curved, flat bases 47 having therein apertures to receive the bolts 44. Projecting axially from the center of the base 47, and thence at a right angle and radially, is a stop lug 48. (See Figures 1, 2 and 3.)

The lug 48 on each loading stop 45 is adapted to be engaged by a roller 49, freely mounted in the forked outer end 50 of a lever arm 51, whose opposite offset end 52 is pivotally attached by a bolt 53'to the raised flange 20 on its respective latch plate. When thus engaged, the lever arm 51 will effectively resist the rotation of the scraper bowl 34 as a wheel.

Above the roller mounting, there is pivotally attached to the forked outer end 52 of the lever arm 51, a hinged link 54 provided at its center with a hinged joint 54 Adjacent this hinged joint a marginal flange 55 is formed on the lower end 56 of the link to engage the side of the link member 57 adjacent the joint 54*, to permit the hinged joint to break upwardly only, when the lower end 56, secured to a transverse release shaft 58, is rotated.

The hinged link 53, when in its extended position as shown at Figure 1, will prevent movement of the lever arm 51. Also, when the shaft 58 is rotated, the hinged joint will be broken and the lever arm 51 and the roller 49 will be withdrawn from the path of the loading stop 45.

Beyond the arms 19, there is attached to each end of the shaft 58, a short lever arm 59, and between its outer end and the bolt 53, there is a helical tension spring 60 to return and hold the lever arm in its normal position. The shaft 58 has attached thereto, near its center, a lever arm 61. In its upper end there is an aperture 62 through which a rope or cable 63 may be secured to enable the operator seated on the tractor to draw it forwardly, its rearward travel being accomplished by the spring 60.

When this lever arm 61 is drawn forwardly, the rollers 49 will be withdrawn from the path of the loading stops 45, 45, and as the loaded scraper bowl is drawn forwardly, it will rotate as a wheel until the unloading or spreading stops 46, 46 engage the rollers 49, 49, which have returned to their normal positions as shown in Figures 1 and 2.

With the unloading stops in engagement with the rollers 49, 49, the wear shoes will be beneath the bowl to support its weight upon the earth; and when the rotation of the bowl is'arrested by the unloading stop 46, the forward beveled edge 39 of the blade 38 will be positioned a desired distance above the earth to level off the material discharged from the bowl and to a desired and adjustable depth.

By adjusting the loading and unloading stops 45 and 46 through utilization of the various bolt holes 43, varying degrees of bite may be secured, as well as varying depths to which the discharged material will be spread.

When in operation and while being drawn forwardly, the bowl has a tendency to turn counterclockwise by virtue of the tractive pull exerted on the torque studs 22 acting as crank pins. Also the trunnion hearings will move rearwardly coextensively with the apertures l2, l2, whereupon the torque studs 22 will rise or ride against the upper end of the slots 15, 15, thus slightly elevating the forward edge of the blade 38. This also causes the arms 19, 19 to rise.

In order to counteract this tendency and force the blade downwardly into the earth, I have provided the following means. Pivotally attached to the end of each arm 19, is a short curved link 64, whose other end is pivotally secured to a stud 65 attached to the outer end of a lever arm 66. This arm is adapted to be rotated by a transverse control shaft 67, journaled in side bearings 67 secured to the forward end of the end plates 10 and 11 adjacent the cross bar 7 and a center bearing 68 also secured to the cross bar 7 near the center member 2. When the shaft 6'7 is rotated clockwise as viewed in Figure 2, the arms 19, 19 will be drawn downwardly, to counteract the tendency of the torque studs to turn counterclockwise, and since the torque connection through the torque studs 22 is below the center of gravity, and relatively close to the scraper blade, a uniform cut may be obtained, regulated by the downward pull on the arms 19, 19.

Secured to the shaft 67 near its center bearing, is a forwardly projecting lever arm 69. This lever arm is connected at its outer end by a plate member '70 to a forwardly inclined lever arm 71 through whose upper apertured end a control cable '72 is passed for actuation by the operator. The greater the shaft 67 is rotated by the lever arm 69, the more the arms 19, 19 will be depressed, with a consequent increase in the cut or bite of the scraper blade. However, the extreme downward movement of the arms 19, 19 will be limited by their engagement with the rear inclined faces 73 of the side members 3 and, 4 of the hitch or towing frame.

Having described my invention, I claim:

1. In a'device of the type described, a bowl, a bit secured to said bowl, an inner frame in which said bowl is pivotally mounted, a towing frame outlying the inner frame, and formed with oppositely disposed axial slots and below the latter, with upwardly inclined slots, bearings for the bowl projecting from the inner frame into the axial slots in the towing frame, studs projecting from the inner frame into the upwardly inclined slots in the towing frame, stop means to prevent the bowl from turning as a wheel when it is drawn forward by the towing frame, and lever means for preventing an upward movement of the inner frame when the bowl is drawn forward in a loading position.

2. In a device of the type described, a scraper bowl, an inner frame in which said bowl is pivotally mounted, a towing frame, outlying the inner frame, and formed with oppositely disposed axial slots and below the latter, with upwardly inclined slots, bearing means for the bowl projecting from the inner frame into the axial slots in the towing frame, projections on the inner frame extending into the upwardly inclined slots in the towin frame, stop means to prevent the bowl from turning as a wheel when it is drawn forward by the towing frame, and means for preventing an upward movement of the inner frame when the bowl is drawn forward in a loading position.

3. In a device of the type described, a scraper bowl, an inner frame in which said bowl is pivotally mounted, a towing frame, outlying the inner frame, and formed with oppositely disposed axial slots and below the latter, with upwardly inclined slots, bearing means for the bowl projecting from the inner frame into the axial slots in the towing frame, projections on the inner frame extending into the upwardly inclined slots in the towing frame, stop means to prevent the bowl from turning as a wheel when it is drawn forward by the towing frame, a transverse shaft, linkage connected between said shaft and the front end of the inner frame, and a lever secured to said shaft whereby, when said lever is pulled forwardly by the operator, an upward crank movement of the inner frame will be prevented.

4. In a device of the type described, a scraper bowl, a blade secured to said bowl, an inner frame, oppositely disposed axial bearing cups carried by the rear side portions of the inner frame, trunnions on said bowl adapted to enter said bearing cups whereby the bowl may turn freely in them, a towing frame outlying the inner frame and formed with oppositely disposed axial slots, and below the latter with upwardly inclined slots, said bearing cups projecting from the sides of the inner frame into the axial slots in the towing frame, torque studs projecting from the inner frame into the upwardly inclined slots of the towing frame, stop means to prevent the bowl from turning as a wheel when it is drawn forwardly by the towing frame, and hand control means for preventing an upward movement of the inner frame when the bowl is drawn forwardly in its loading position.

5. In a device of the type described, a scraper bowl, an inner frame, oppositely disposed bearings carried by the rear side portions of the inner frame, trunnions on said bowl adapted to enter said bearings whereby the bowl may turn freely in them, a towing frame outlying the inner frame and formed with oppositely disposed axial slots, and below the latter with upwardly inclined slots, said bearings projecting from the sides of the inner frame, torque studs projecting from the inner frame into the upwardly inclined slots of the towing frame, stop means to prevent the bowl from turning as a wheel when it is drawn forwardly by the towing frame, and control means for preventing an upward movement of the inner frame when the bowl is drawn forwardly in its loading position.

' JAMES S. STEWART. 

